Mouthpiece



FIG. 1 is a front, right perspective of a mouthpiece showing my new invention;

FIG. 2 is a rear, left side perspective view thereof.

FIG. 3 is a front view thereof.

FIG. 4 is a top view thereof.

FIG. 5 is a right side view thereof, the left side view being a mirror image.

FIG. 6 is a rear view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines form no part of the claimed design. 

The ornamental design for a mouthpiece, as shown and described. 